Roller-bushing for sheaves.



n. 697,524. Patented Apr. |51 |902.

y C. E. MGINTIBE.' ROLLER BUSHING FOR SHEAVES.

(Application filed my 2a, 1901.)

(l0 Model.)

UNITED STATES PATENT OFFICE.

CLARENCE E. MCINTIRE, OF CAMDEN, MAINE, ASSIGNOR TO THE DUPLEX ROLLERRUSHING COMPANY, OF CAMDEN, MAINE, A CORPORATION OF MAINE.

ROLLER-BUSHING FOR sHEAvEs.

SPECIFICATION forming part of Letters Patent N o. 697,524, datedApril15, 1902.

Application filed May 23,1901.

T0 all wwnt it may concern:

Beit known thatl, CLARENCE E. MCINTIRE, of Camden, inthe county of Knoxand State of Maine, have invented certain new and useful Improvements inRoller Bushings for Sheaves, 85C. of which the following is aspeciioation.

This invention relates to a bushing for sheaves and-pulleys, the bushingcomprising a cylindrical chamber formed for attachment to the center ofa pulley and adapted to present a cylindrical bearing to the peripheriesof a series of rolls and to coniine said rolls against displacement inany direction, the rolls being arranged in a circular series surroundingthe pin or shaft on which the pulley rotates.

The invention consist-s in the improvements which I will now proceed todescribe and claim.

Of the accompanying drawings, forming a part of this specification,Figure l represents a side elevation of a sheave or pulley havingabushing embodying my invention. Fig. 2 represents a section on line 2 2of Fig. l. Figs. 3 and 4 represent perspective sectional views of thetwo members ofthe bushing, said parts being separated and the rollsremoved. Fig. 5 represents a sectional view of one of the members of thebushing with the rolls inserted therein.

The same reference characters indicate the same parts in all of thefigures.

c represents the body of the sheave, which is cast or otherwise formedwith a central aperture or socket to receive the bushing, the latterbeing composed of two members c b, which are formed to have a drive litin the wall of the socket in the pulley c, so that they can be forcedinto the socket by strong pressure and when inserted are held byfriction in the pulley. Each member comprises a cylindrical marginalportion 2 and a flange 3, formed on one end of the said marginalportion. The inner ends of the marginal portions of the two members areformed to be detachably and positively coupled or connected togetherwithin the pulley, as shown in Fig. 2, the two members collectivelyforming a bushing having a chamber with a cylin- Serial No. 611550. (Nomodel.)

drical marginal bearing-surface 4, which constitu tes the outer bearingfor a series of bearing-rolls 5 and a series of separating-rolls 6.

The coupling or connecting means comprisean external screw-thread 14,formed on the member a, and an internal screw-thread 15, formed on themember b.

Each of the flanges 3 is provided in its inner side with an annulargroove 7, said groove being separated from the marginal face 4 by auouter bearing-surface 8 and from the inner margin 9 of the flange by aninner bearing-surface 10. These two bearings 8 and 10 are annular andsupport the ends of the rolls 5 and -that is to say, the ends of therolls 5 extend across the two end bearing-surfaces 8 and lO and aresupported thereby against endwise displacement, While the ends of theseparating-rolls 6 bear only against the outer end-thrust bearings S.The grooves '7 receive trunnions 12, formed on the ends of thebearing-rolls 5.

' In assembling the parts above described the l rollers 5 and 'areassembled in one of the bushing members, as shown in Fig. 5, The otherbushing member is then positively conneoted to the roll-receivingmember, and the connected members are then inserted and forced into thesocket of the pulley, as shown in Fig. 2.

As shown in the drawings, the marginal portions 2 of the members o. bmeet at the middle of the cylindrical opening of the sheave or pulley.This provides a construction which enables anyA two members a b to beequally well secured in place by the drive fit above described, the twomembers receiving equal k amounts of pressure and wear from the rolls 5.Briefly stated, the described construction of the members. adapts themto be properly secured in the cylindrical opening of a metal sheaveorpulley solely by a drive iit, so that said members are practicallyinseparable from the pulley. Obviously these features of advantage couldnot be possessed by a wooden sh eave or pulley, for the reason that themembers a b could not be held therein solely by friction or a drive fit.The invention is therefore particularly adapted to metallic sheaves.

It will be seen that the outer and inner IOO end-thrnst-bearing faces 8and 10, formed on the flanges constituting the end walls of theroller-receiving chamber, distribute the wear on the ends of thebearing-rolls 5 at both sides of the centers of said rolls, so that theWear on the ends of the rolls and on the inner faces of the flangeswhich support the end thrust of the rolls is reduced to a minimum.

An important feature of my invention is the bushing made in two sectionsor members with complemental coupling devices, such as the screw-threads14 and l5, the two members when coupled together being rigidly connectedand forming virtually a one-part bushing which retains the rolls inoperative position and is ready for insertion in a metal sheave, therolls being held by the bushing in position to surround the shaft orspindle on which the sheave rotates. The advantages of this feature ofmy invention are as follows:

First. The bushing members, with their coupling means, permit thebushing as a whole to be set up at the place of manufacture and storeduntil wanted and shipped to users, who may insert them in their ownsheaves, all Without separating the members or disturbing thearrangement of the rolls therein.

Second. When the complete bushing is driven into the sheave, thecoupling devices connecting the members enable either member to assistin holding the other, so that in case one member should be a trifleloose while the other has a tight friction fit in the sheave the loosemember is prevented from working outwardly by the coupling devicesconnecting it to the tight member.

Third. When the bushing is being pressed into the sheave, the couplingdevices connecting the two members insure the same relation of themembers after they are forced to place in the sheave that they occupiedbefore being forced in, whereas if the two members are separate anddriven independently into the sheave one may be forced in slightlyaskew, so that the bearing-surfaces for the peripheries and ends of therolls will be out of their proper adjustment and excessive and injuriouswear of the rolls will take place.

The rolls are preferably made of cold-rolled case-hardened steel and formarine use are preferably coated with a non-corrosive coating applied byelect-rodeposition, said coating preventing the rolls from being rustedby salt water.

I claim- A roller-bushing comprising two separable bushing membersadapted to enter a socket in a sheave or pulley, and having positiveconnecting devices at their meeting inner ends, each member having acylindrical recess in its inner side, the margin of which forms araceway, and an annular ange at its outer end forming an end wall of therccess, said flange having in its inner side an annular groove separatedfrom the raceway margin and from theinner edgeoftheflangeby outer andinner annular bearing-surfaces,a series of bearing-rolls in contact withthe cylin- .drical margin of the chamber and having tru nnionsprojecting into the grooves of the flanges, and a series ofseparating-rolls in contact with the said cylindrical margin and withthe bearing-rolls, the ends of the separating-rolls bearing against theouter bearing-surfaces, while the ends of the bearingrolls bear againstboth the outer and the iuner bearing-surfaces.

In testimony whereof I have aixed my signature in presence of twowitnesses.

CLARENCE E. MCINTIRE.

Witnesses:

ROY 1I. MARKS, FRED W. GREY.

